Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b14f392d354f59…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 16:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed0d8882b70001ea6dd3db8709e09598 SHA-1: 244b212943e6329e9bcd76d9305240758239ead4 SHA-256: d5b14f392d354f590d15d72cdec571c52a577ddea61907d57e1a67e3418c7d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wadsoda.com/UserFiles/File/56011863668.pdf In PDF document text
    • http://ahkjt.com/upfile/file/misuxijekazovulofek.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/59707213937.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/13872692988.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/15408417217.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/5a50f98d65e830b2821ca34df721094e/12101974283.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fabef08815---buzoduduzagawones.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/70005704471.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/17364763851.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/lebilirubudijifedisife.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c19db5e2---vapepaderokorivivojoma.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/sekotovufazonefowasapujos.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5063c7363---pisekimomenokewutebama.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/62196010119.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/pikuvakepovibosupep.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/201901d0eb1dbff48a93d2e43dcf52e9/26660512072.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/gagev.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed059c3a76---fimokokevukaliru.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ldbimjdvnanvfluj32rgvbiiv3/vuzidejunexikap.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/48994673906.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/fegiwinewemoku.pdfIn PDF document text
    • https://aneri12.eu/res/file/xowogajurabif.pdfIn PDF document text
    • http://jonme.net/ckupload/files/rutejasubabeliveroxizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chondromalacia+exercises+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC2 16360 bytes
SHA-256: 07e0253a6615c74e10aac71cc0fe513ddb992257fb763be78c805f5398e8296a
font_01_sfnt_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 10920 bytes
SHA-256: dbd9e94f1cbccb9548fd4dacb6220a8c8c051fe91733994a3a3602b231d64ad7

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